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Flight Reliability

B6 434 · JetBlue Airways

San Francisco → Boston (SFO–BOS)

89
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
2 min early
Average arrival delay
1.3%
Cancelled
12 min early
Median arrival delay

Based on 319 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 92% of the time, against 86% between 6–9 AM.

Saturday is the weak spot.

B6 434 arrived on time 90% of the time on Fridays. On Saturdays: 80%.

Better than the SFO–BOS route average.

B6 434 arrived on time 86% of the time, versus 79% across the SFO–BOS route.

Better than the JetBlue Airways network average.

B6 434 arrived on time 86% of the time, versus 73% across the JetBlue Airways network.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue85%(48 flights)
  • Wed85%(48 flights)
  • Thu80%(51 flights)
  • Fri90%(52 flights)
  • Sat80%(15 flights)
  • Sun90%(51 flights)
On-time by departure window
  • 6–9 AM86%(303 flights)
  • 9 AM–12 PM92%(12 flights)
On-time trend by month
86%
May

Jun 90% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202594%31
August 202591%23
September 202585%26
October 202574%27
November 202579%24
December 202570%27
January 202692%24
February 2026100%22
March 202689%27
April 202685%26
May 202686%28
Departures on time
89%
Diverted
0%
Flights flown
315
Months covered
12

Same route, other flights

Keep nerding

Based on 319 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.